The North American Aerospace Defence Command (NORAD) takes a break from its usual duties every Christmas Eve to help children follow Santa live.NORAD began tracking Santa when a 1955 advert encouraged children to phone Santa - but gave the wrong number.When he realised what had happened, Colonel Harry Shoup - who came to be known as the “Santa Colonel” - quickly told his staff to answer the calls with an update on Father Christmas's current position.It developed into a tradition where volunteers staff call centres on Christmas Eve and take around 70,000 phone calls each year from 200 countries.